The reference picture I gave has the uniform of the Papal Swiss Guard (which, since they are now purely ceremonial, have reverted to using pikes), and the one you found has the uniform of the French Swiss Guard. Either uniform would work in an icon, as the Swiss Guard unit will be available to anyone as a mercenary (provided they pick the associated policy) and not associated with any one nation. If you would prefer to make an icon with the French uniform, then I'll use
this unit model to represent the Swiss Guard. In this case, I would like to make one additional request: a minor unit texture recoloring to change the jackets (I'll extract the correct file to be edited and post it here for you if you need it).